Saudi prince invests $300 million in Twitter

The multibillionaire has made a $300-million investment in the popular social media site that activists used during the Arab Spring uprisings. That's roughly a 3% stake in the San Francisco company.

Twitter confirmed the investment, which was announced in a press release from Kingdom Holding Co. that touted Alwaleed's desire to invest in "promising, high-growth businesses with global impact."

A nephew of Saudi King Abdullah, Alwaleed owns 95% of Kingdom Holding, which has stakes in Apple, Citigroup and General Motors. He is one of the richest people in the world, with a net worth of nearly $20 billion, according to Forbes magazine. For more on him, check out this Charlie Rose interview from last year.

Fortune is reporting that he bought his stake in Twitter from insiders, not the company. Twitter spokesman Matt Graves declined to provide any further details. The prince's investment in Twitter has been rumored since October.

The San Francisco company's worth was pegged at $8.4 billion in a funding round led by Digital Sky Technologies in October.

Twitter says it has 100 million active users who send 250 million tweets per day.

One of an elite group of privately held social media companies sporting multibillion valuations, Twitter is taking its time before going public. Facebook, which has more than 800 million users, is planning a $10-billion initial public offering. Twitter is also seen as a major player in social media because of its popularity. The company is still working on its fledgling advertising business.

Twitter's advertising business is expected to generate about $140 million this year, up from $45 million last year, according to EMarketer. Twitter may generate $260 million in ad revenue in 2012, the research firm said. Twitter now has more than 700 employees.

“We believe that social media will fundamentally change the media industry landscape in the coming years. Twitter will capture and monetize this positive trend,” Ahmed Reda Halawani, Kingdom Holdings executive director of private equity and international investments, said in a statement.